A diametric drive, which uses negative and positive mass to accelerate forever, has been created by researchers using effective mass, essentially tricking light pulses into behaving as if they had mass. By firing laser pulses with positive and negative effective mass through two loops of fiber-optic cable, one a bit longer than the other, scientists at Germany's University of Erlangen-Nuremberg found that the pulses accelerated in the same direction, gaining speed with each revolution, essentially cheating Newton's third law of motion.
Light pulses gain speed by tricking Newton's 3rd law of motion
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